Method of treating tire bead



Patented Sept. 6, 1932 UNITED STATES rm, 0! AKRON, OHIO, A CORPORATION OF OHIO PATENT OAFFIICEF .1

BEN w ROWLAND, or AKRON, 0x10, ASSIGNOR 'ro THE eoonynaarmn & nunsnrrcom- J mmnon or, TREATING 'rrnnrnan No Drawing.

This invention relates to a method of treating units of material which are to be incorporated intorubber articles, and it has particular relation to a method of imparting tackiness or adhesiveness'to the surfaces of such articles.

One object of the invention is to provide a method of treating the surfaces of articles whereby to render them tacky or adhesive for relatively long periods of time.

Another object of the invention is to provide a non-inflammable dipping cement for use in the manufacture of rubber goods.

In the manufacture of rubber articles, it is frequently desirable to coat the surfaces of the various plies of material with a tacky substance which will insure adhesion therebetween when the plies are brought into contact with each other. Heretofore, cements consisting of ordinary rubber dissolved in benzene, gasoline or other similar organic solvents. have been employed'for this purpose. Uri'fortunately, these solvents are highlv volatile and also highly inflammable. For that reason, the fire hazard involved in their use is very great. Also, the solvents in such 4 compounds tend to evaporatedquickly when the materials are spread upon the surfaces to be treated. Therefore, the treated surfaces quickly lose their tacky nature.v Accordingly, supplies of coated material cannot be stored for any great length of time prior to their incorporation into the finished articles for which they are designed.

This invention consists in the provision of an adhesive cement consisting essentially of latex intermixed with a small amount of pine tar, together with any other minor ingredients which special circumstances may render desirable. A coating composition which has been found particularly useful for dipping or coating fabric covered pneumatic tire beads prior to their incorporation into tire carcasses may be prepared in the following manner.

Emulsify cc. of pine tar oil with approximately cc. of a dilute soap solution, together with 40 cc. of a pine oil (preferably oxidized), and incorporate this mixture into 50 cc. of ordinary ammonia preserved latex Applicat on filed. July 27, 1929. Serial No. 381,672,

having'a concentration of approXimatelyBt);

per cent of rubber; In the preparationof this compound 'a pine tar of relatively viscous L nature should'be employed. "In'inaking determinations of the viscosity of the tar,'a

tral bafile, such as the one bearing'c'atalog N 0.

14,185 should be used in the determination. C The tar should beof su'ch viscosity as to permit approximately three revolutions per minute of the revolving cylinder of the 'vis-' 1 cosime-ter when a weight of 200 grams is attached to the actuating cord.

Substantially any oxidized employed in the composition, a typical expine oil may be ample of one such oil being the material soldf under the trade name of ;Hei-cosol:?

which is prepared by the Hercule's Powderf Company, of lVilmington, Delaware.

The various ingredients are thoroughly agltated'in order to insure complete GIIllllSlfie cation thereof, after which they are ready for:

use in coating substantially any material towhich itis desirable to'imparta tacky org' sticky surface. i 4 i As previously intimated, the compound has been found to beparticularlyuseful in the treatmentof the non-extensible grommets? employed as beads in themanufacture Eof pneumatic tires. The beads may be coated merely by dipping them into a bath of the latex compound and then permitting them to drain. Beads so treated may bekcpt in storage for several days without losing their tackiness. In case they become somewhat dry it is merely necessary to moisten themwith' benzene or gasoline to restore them to substantially their original condition.

The cost of such materials is extremely low, because the principal ingredientconsists of latex in substantially the condition in which it is obtained from the rubber plantations. The other ingredients are also comparatively inexpensive. Also, the pine tar and the pine oil are practically non-inflammable when incorporated into such aqueous emulsions as latex. Therefore, the fire hazard involved in the use of the new cements is ractically nil.

lthough I have described in detail only the preferred forms which the invention may assume, it will be apparent to those skilled in the art that the invention is not 'so limited, but that various modifications may be made therein without departing from the spirit 'of the invention or from pended claims.

What I claim is:

1. A method of treating the beads of pneu matic tires prior to their incorporation into the tires which comprises coating them with a mixture of latex, oxidlzed pine 011 and pine,

tar havin ,such viscosity as to permit approximate y three revolutions per minute of the revolving cylinder of a Stormer viscosimeter when the latter is actuated by a weight of 200 rams. v

2 A ad for a pneumatic tire which has been coated with a mixture comprising 500 .cc. of ammonia preserved latex, 60 cc. of pine tar and 4000. of oxidized pine oil.

3. 'Amet-hod of treating beads for pneumatic-tires prior to incorporationinto such tires which comprises coating them witha mixture voflatex, oxidized pine oil and pine tar.

matic tires prior to incorporation into sue tires which comprisescoating them with a mixture ex'nbodymg, by volume,p25 arts of ammoniacalla'tex, 3 parts pine tar an 2 parts of oxidized pine oil. v

5. Apneumatic tire bead that has been coated with a; mixture comprising as ingredients latex, oxidized-pine oil and pine tar having such [viscosityvv as to permit approximately three revolutions per minute of the revolving cylinders of a simmer viscosimeter when the latter is actuated by weight of 200 rams.

In witness whereof, I have hereunto signed m na'melat Akron,-in the county of Summit andState of. Ohio, U. S. A.,' this 26th day of July, 1929; 5 1

- BEN WROWLAND.

the scope'ofthe'a a a 4. A method of treating beads for pneu- 

